試題詳解

38. A 60 year old man presents with abdominal pain and a CT reveals a mass within the gastrointestinal system, which is resected. Histopathologic examination reveals a submucosal mass composed of spindle cells with lightly eosinophilic cytoplasm arranged in a syncytial pattern. The pathologic diagnosis is a GIST, spindle cell type. Which of the following answer choices correlates with the most favorable prognosis for this patient?
(A) KIT mutation present
(B) Mass 11 cm in greatest dimension
(C) Mass located in the jejunum
(D) Mitotic rate ＞10 per 50HPF